TX	RI
RI	NY
NY	NJ
NJ	NC
NC	MA
MA	KS
KS	IN
IN	IA
IA	GA
GA	CA
CA	null
WY	WI
WI	VT
VT	SD
SD	SC
SC	OR
OR	NE
NE	MN
MN	FL
FL	CO
CO	AZ
AZ	null
